The Director by David Ignatius

Pretty good, too long. Interesting characters. PW Graham Weber has been director of the CIA for less than a week when a Swiss kid in a dirty T-shirt walks into the American consulate in Hamburg and says the agency has been hacked, and he has a list of agents' names to prove it. This is the moment a CIA director most dreads. Weber isn' t sure where to turn until he meets a charismatic (and unstable) young man named James Morris who runs the Internet Operations Center. He' s the CIA' s in-house geek. Weber launches Morris on a mole hunt unlike anything in spy fiction - one that takes the listener into the hacker underground of Europe and America and ends up in a landscape of paranoia and betrayal.